Influence of In-Plane Propagation Direction on the Performance of Surface Acoustic Wave Filters
To meet the increasing demand for Q-value and out-of-band suppression in narrowband surface acous-tic wave filters,this paper proposes a design method based on a new type of piezo on insulator(POI)structure re-sonator.The purpose of changing the wave propagation angle is achieved by rotating the resonator,and accurate ex-perimental data are obtained using a two-dimensional full model,which is compared with the original structure re-sonator in the filter design.The experimental results show that this method can effectively increase out-of-band sup-pression,with a 2-4 dB improvement in transition band suppression ability.Additionally,the design is simple and requires little space.
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